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Edit: /opt/golang/1.19.4/src/strconv/ctoa.go

// Copyright 2020 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package strconv

// FormatComplex converts the complex number c to a string of the
// form (a+bi) where a and b are the real and imaginary parts,
// formatted according to the format fmt and precision prec.
//
// The format fmt and precision prec have the same meaning as in FormatFloat.
// It rounds the result assuming that the original was obtained from a complex
// value of bitSize bits, which must be 64 for complex64 and 128 for complex128.
func FormatComplex(c complex128, fmt byte, prec, bitSize int) string {
	if bitSize != 64 && bitSize != 128 {
		panic("invalid bitSize")
	}
	bitSize >>= 1 // complex64 uses float32 internally

// Check if imaginary part has a sign. If not, add one.
	im := FormatFloat(imag(c), fmt, prec, bitSize)
	if im[0] != '+' && im[0] != '-' {
		im = "+" + im
	}

return "(" + FormatFloat(real(c), fmt, prec, bitSize) + im + "i)"
}

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