Revert "included dtype conversion of mangled cols in c parser"

This reverts commit cf27280.

Author: debnathshoham

pandas/_libs/parsers.pyx

@@ -989,10 +989,6 @@ cdef class TextReader:
                         col_dtype = self.dtype[name]
                     elif i in self.dtype:
                         col_dtype = self.dtype[i]
-                    else:
-                        if isinstance(name, str) and name.split(".")[-1].isnumeric():
-                            orig_name = ".".join(name.split(".")[:-1])
-                            col_dtype = self.dtype.get(orig_name, None)
                 else:
                     if self.dtype.names:
                         # structured array