Resolve "Remake Modular inverse"

Closes #10 (closed)

inverse_mult.py

 # Created : 06/12/2021
+# Refactored : 09/12/2021
 
-import math
+from euclide import *
 
+# Get the multiplicvative inverse of a Mod p
+# x = Multiplicative inverse of a mod p:
+# a * x mod p = 1
 def inverse_mult(a, p) :
-    c = abs(a^-1 % p)
-    if(p - c + abs(a) == 1):
-        return c
-    return False
+    pgcd, x, y =  pgcd_etendu(a, p)
+    if pgcd != 1:
+        return None
+    if a > p:
+        return x
+    else:
+        return y
+
+if __name__ == "__main__":
+    print(inverse_mult(3, 11))
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