add convolve command

cmd/common.go

@@ -0,0 +1,32 @@
+/*
+Copyright © 2026 filifa
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+package cmd
+
+import (
+	"bufio"
+	"os"
+)
+
+func splitLines(file *os.File) []string {
+	slice := make([]string, 0)
+	scanner := bufio.NewScanner(file)
+	for scanner.Scan() {
+		slice = append(slice, scanner.Text())
+	}
+
+	return slice
+}