diff --git a/Exercice_1_-_Le_champ_de_Noel/champ.py b/Exercice_1_-_Le_champ_de_Noel/champ.py
index ad40737..1300539 100644
--- a/Exercice_1_-_Le_champ_de_Noel/champ.py
+++ b/Exercice_1_-_Le_champ_de_Noel/champ.py
@@ -1 +1,53 @@
-# Met ton code ici
+#!/usr/bin/env python3
+
+from random import randrange
+
+def main():
+    # Columns = 7 Lines = 5
+    TREE = [
+        "   ^",
+        "  ^ ^",
+        " ( o )",
+        "( o o )",
+        "   U"
+    ]
+    NB_TREES = 6
+
+    NB_COLUMN = 60  # Min 7+2+2 = 11 (sans les bordures (+2))
+    NB_LINES = 40   # Min 5+3 = 8 (sans les bordures (+2))
+
+    VERTICAL_EDGE = (NB_COLUMN + 2) * '#'
+    LINE_WO_TREE = '#' + ' ' * (NB_COLUMN) + '#'
+
+    TREE_COORD = [(randrange(4, NB_COLUMN + 1 - 3),randrange(5, NB_LINES + 1)) for tree in range(NB_TREES)]
+
+    TREE_COORD = sorted(TREE_COORD, key=lambda y: y[1])
+    X_COORD = [TREE_COORD[tree][0] for tree in range(NB_TREES)]
+    Y_COORD = [TREE_COORD[tree][1] for tree in range(NB_TREES)]
+
+    print(TREE_COORD)
+    print(X_COORD)
+    print(Y_COORD, "\n")
+
+    # J'ai descendu tout ce qui concernait la forest ici... c'est plus clair
+    forest = [VERTICAL_EDGE] + [LINE_WO_TREE for i in range(NB_LINES)] + [VERTICAL_EDGE]
+    for y in range(NB_LINES+2):
+        forest[y] = list(forest[y].strip())
+
+    # La nouvelle double boucle
+    for i in range(NB_TREES):
+        TREE_HEIGHT = len(TREE)
+        X_OFFSET = 3
+        for tree_line in range(TREE_HEIGHT):
+            Y = Y_COORD[i] - (TREE_HEIGHT - tree_line - 1)
+            X_START = X_COORD[i] - X_OFFSET
+            X_END = X_COORD[i] - X_OFFSET + len(TREE[tree_line])
+
+            forest[Y][X_START:X_END] = TREE[tree_line]
+
+    for i in range(len(forest)):
+        print(''.join(forest[i]))
+    print("\n")
+
+if __name__ == '__main__':
+    main()
diff --git a/Exercice_2_-_Le_chiffre_de_Cesar/caesar.py b/Exercice_2_-_Le_chiffre_de_Cesar/caesar.py
index eb26a67..c0ca1bf 100644
--- a/Exercice_2_-_Le_chiffre_de_Cesar/caesar.py
+++ b/Exercice_2_-_Le_chiffre_de_Cesar/caesar.py
@@ -81,39 +81,57 @@
 ']'
 """
 
+import string
 
 def do_cipher(plain_text: str, key: int) -> str:
-    # Met ton code ici
-    return "Il faudrait retourner un vrai truc ;)"
-
+    LIM_MIN_DOWN = ord('A')
+    LIM_MIN_UP = ord('Z')
+    ALPHABET_LOOP = len(string.ascii_uppercase)
+    
+    cipher_text = []
+
+    plain_text = plain_text.upper()
+    
+    for i in plain_text:
+        if i in string.ascii_uppercase:
+            ascii_value_plain = ord(i)
+            ascii_value_cipher = ord(i) - key
+            if key < 0:
+                if ascii_value_cipher > LIM_MIN_UP:
+                    ascii_value_cipher -= ALPHABET_LOOP
+            else :
+                if ascii_value_cipher < LIM_MIN_DOWN:
+                    ascii_value_cipher += ALPHABET_LOOP
+            cipher_text.append(chr(ascii_value_cipher))        
+        else:
+            cipher_text.append(i)
+        cipher_text_string = "".join(cipher_text)
+    return cipher_text_string
 
 def do_decipher(cipher_text: str, key: int) -> str:
-    # Met ton code ici
-    return "Il faudrait retourner un vrai truc ;)"
-
+    plain_text_string = do_cipher(cipher_text,-key)
+    return plain_text_string
 
 def main():
     PLAIN_TEXT = "Ave Caesar morituri te salutant"
-    KEY = 3
+    KEY = -10
 
     print("************ Caesar's cypher ************\n\n")
     print("Plain text   :", PLAIN_TEXT)
     print("key          :", KEY)
-    print()
 
-    print("Let's cipher now!")
+    print("\nLet's cipher now!")
     CIPHER_TEXT = do_cipher(PLAIN_TEXT, KEY)
     print("Cipher text  :", CIPHER_TEXT)
     print()
 
-    print("Let's decipher (will it work?!)")
-    DECIPHER_TEXT = do_decipher(PLAIN_TEXT, KEY)
+    print("\nLet's decipher (will it work?!)")
+    DECIPHER_TEXT = do_decipher(CIPHER_TEXT, KEY)
     print("Decipher text:", DECIPHER_TEXT)
     print()
-
+      
     SUCCESS = PLAIN_TEXT.upper() == DECIPHER_TEXT
     print("Did it worked?", "OK :)" if SUCCESS else "Nope :(")
-
-
+    
 if __name__ == "__main__":
     main()