fix bugs related to assign statement

[task4233]

Overview

fix bugs below.

not implemented: &ast.AssignStmt{Lhs:[]ast.Expr{(*ast.Ident)(0xc000022540)}, TokPos:264, Tok:47, Rhs:[]ast.Expr{(*ast.CallExpr)(0xc000108cc0)}}
please report this bug to https://github.com/task4233/dl/issues/new/choose 🙏

[codecov-commenter]

Codecov Report

Merging #25 (a76d6af) into main (19ac8a4) will decrease coverage by 1.97%.
The diff coverage is 72.97%.

@@            Coverage Diff             @@
##             main      #25      +/-   ##
==========================================
- Coverage   76.09%   74.11%   -1.98%     
==========================================
  Files           7        7              
  Lines         205      255      +50     
==========================================
+ Hits          156      189      +33     
- Misses         25       36      +11     
- Partials       24       30       +6     

Impacted Files	Coverage Δ
clean.go	72.03% <72.30%> (-4.59%)	⬇️
utils.go	76.92% <77.77%> (+0.45%)	⬆️

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