Write a python function convert_names(inputf, outputf) where the input file contains one variable name on each line. Each variable name is either camelCase or snake_case. If the name is camelCase, the function should convert it to snake_case and vice versa. The function should then write these new variable names to the output file.

def test_convert_variable_names():

# test 1

convert_variable_names("input.txt", "output.txt")

f = open("output.txt", "r")

result = f.readlines()

assert(result == ["all_results ", "totalSum ", "returnList"])

f.close()

# test 2

convert_variable_names("input1.txt", "output1.txt")

f = open("output1.txt", "r")

result = f.readlines()

assert(result == ["varA ", "varB ", "varC ", "new_var_a ", "var_b ", "newVarC"])

f.close()

print("done!")