Hacktoberfest 2020: Rename method for project_euler/problem_99 (TheAlgorithms#2981)

* name method solution in project_euler/problem99

* rename function

Author: wenhongg

Diff for: project_euler/problem_99/sol1.py

@@ -17,9 +17,9 @@
 from math import log10
 
 
-def find_largest(data_file: str = "base_exp.txt") -> int:
+def solution(data_file: str = "base_exp.txt") -> int:
     """
-    >>> find_largest()
+    >>> solution()
     709
     """
     largest = [0, 0]
@@ -31,4 +31,4 @@ def find_largest(data_file: str = "base_exp.txt") -> int:
 
 
 if __name__ == "__main__":
-    print(find_largest())
+    print(solution())