// The next word is a sequence of characters that must start upper case.
		if isASCIILower(c) {
			c ^= ' ' // Make it a capital letter.
		}
		t = append(t, c) // Guaranteed not lower case.
		// Accept lower case sequence that follows.
		for i+1 < len(s) && isASCIILower(s[i+1]) {
			i++
			t = append(t, s[i])
		}
	}
	return string(t)
}

			want: false,
		},
		{
			name: "b",
			c:    'b',
			want: true,
		},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			if got := isASCIILower(tt.c); got != tt.want {
				t.Errorf("isASCIILower() = %v, want %v", got, tt.want)
			}
		})
	}
}

func Test_isASCIIDigit(t *testing.T) {
	tests := []struct {
		name string
		c    byte
		want bool
	}{
		{