Revert "removed updation of dtype dict from c parser"

This reverts commit f0f3022.

Author: debnathshoham

pandas/_libs/parsers.pyx

@@ -108,6 +108,7 @@ from pandas.core.dtypes.common import (
     is_object_dtype,
 )
 from pandas.core.dtypes.dtypes import CategoricalDtype
+from pandas.core.dtypes.inference import is_dict_like
 
 cdef:
     float64_t INF = <float64_t>np.inf
@@ -687,6 +688,13 @@ cdef class TextReader:
                                 counts[name] = count + 1
                                 name = f'{name}.{count}'
                                 count = counts.get(name, 0)
+                            if (
+                                self.dtype is not None
+                                and is_dict_like(self.dtype)
+                                and self.dtype.get(old_name) is not None
+                                and self.dtype.get(name) is None
+                            ):
+                                self.dtype.update({name: self.dtype.get(old_name)})
 
                     if old_name == '':
                         unnamed_cols.add(name)