Update edit distance.py

Author: je-suis-tm

edit distance.py

@@ -21,7 +21,7 @@ def edit(a,b):
 
  for l in range(1,len_a+1):
  for m in range(len_b+1):
- if len_a==len_b:
+ if a[l-1]==b[m-1]:
  c[l][m]=min(c[l-1][m]+1,c[l][m-1]+1,c[l-1][m-1])
  else:
  c[l][m]=min(c[l-1][m]+1,c[l][m-1]+1,c[l-1][m-1]+1)