simplify code

Author: charlesdong1991

pandas/core/internals/managers.py

@@ -1973,19 +1973,15 @@ def items_overlap_with_suffix(left, lsuffix, right, rsuffix):
 
         def lrenamer(x):
             if x in to_rename:
-                if lsuffix is None and isinstance(x, str):
-                    return '{x}{lsuffix}'.format(x=x, lsuffix='')
-                elif lsuffix is None and isinstance(x, (float, int)):
+                if lsuffix is None:
                     return x
                 else:
                     return '{x}{lsuffix}'.format(x=x, lsuffix=lsuffix)
             return x
 
         def rrenamer(x):
             if x in to_rename:
-                if rsuffix is None and isinstance(x, str):
-                    return '{x}{rsuffix}'.format(x=x, rsuffix='')
-                elif rsuffix is None and isinstance(x, (float, int)):
+                if rsuffix is None:
                     return x
                 else:
                     return '{x}{rsuffix}'.format(x=x, rsuffix=rsuffix)