human
Solve the following python programming problem given the following code:
def _convert_pyx_sources_to_c(self) : 
    'convert .pyx extensions to .c' 
    def pyx_to_c(source) : 
        if source.endswith ('.pyx') : 
            source = (source [: (- 4)] + '.c') 
return source 
self.sources = map (self, self.sources) 

    
    

    Fix the buggy line: self.sources = map (self, self.sources)
assistant
#Here is Python program to fix the buggy line: self.

self.sources = map (def pyx_to_c(, self.sources)